That's a question you should ask Givi as it's their design. But otherwise you just volunteered to be the test case 
I mean, they do offer the monokey system (for the G310 GS at least): Supports pour valises latérales Givi Monokey BMW G 310 GS 17-22 - Pièces Bagagerie sur La Bécanerie which seems pretty solid (and would have been compatible with my topcase, in my case...Personally I am disappointed that Givi does not offer a side case/soft bag mounting for the G310.